RT9205APS datasheet(5/15 Pages) RICHTEK

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RT9205/A

Preliminary

DS9205/A-08 March 2007

www.richtek.com

Functional Pin Description

LGATE (Pin 1)

Connect the LGATE pin to the gate of lower MOSFET.

This pin provides the gate drive for the lower MOSFET.

PGND/GND (Pin 2, 3)

Signal and power ground for the IC. All voltage levels are

measured with respect to this pin.

VCC (Pin 4)

This is the main bias supply for the RT9205/A. This pin

also provides the gate bias charge for the gate of lower

MOSFET. The voltage at this pin is monitored for ensuring

a proper power-on reset (POR). This pin is also the out

of an internal 6.0V regulator that powered from the BOOT

pin when the BOOT pin is directly powered from ATX

12V.

DRV (Pin 5)

This pin is the output of a linear controller. It should be

connected to the base of an external bypass NPN

transistor or the gate of a N-MOSFET to form a linear low

dropout regulator.

FBL (Pin 6)

This pin is connected to the output resistor-divider of an

external power transistor or a N-MOSFET based low

dropout regulator for regulating and monitoring the output

voltage. This pin is also connected to the protection

monitor and the invertering input of error amplifier of

internal linear regulator inside the IC.

FB (Pin 9)

This pin is connected to the PWM converter's output-divider

for regulating and monitoring the output voltage of buck

converter. This pin also connects to the protection monitor

and the inverting input of internal PWM error amplifier inside

the IC.

BOOT (Pin 13)

This pin provides ground referenced bias voltage to the

upper MOSFET driver. A bootstrap circuit is used to create

a voltage that is suitable for driving a logic-level N-MOSFET

when operating at a single 5V power supply. This pin also

could be powered from ATX 12V, in this situation, an internal

6.0V regulator will supply to VCC pin for generating bias

required inside the IC.

UGATE (Pin 14)

Connect the UGATE pin to the gate of upper MOSFET.

This pin provides the gate drive for the upper MOSFET.

NC (Pin 7,8,10,11,12)

No Connection.

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